243123132449 has 2 divisors, whose sum is σ = 243123132450. Its totient is φ = 243123132448.

The previous prime is 243123132433. The next prime is 243123132457. The reversal of 243123132449 is 944231321342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208300960000 + 34822172449 = 456400^2 + 186607^2 .

It is a cyclic number.

It is not a de Polignac number, because 243123132449 - 2⁴ = 243123132433 is a prime.

It is not a weakly prime, because it can be changed into another prime (243128132449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121561566224 + 121561566225.

It is an arithmetic number, because the mean of its divisors is an integer number (121561566225).

Almost surely, 2^243123132449 is an apocalyptic number.

It is an amenable number.

243123132449 is a deficient number, since it is larger than the sum of its proper divisors (1).

243123132449 is an equidigital number, since it uses as much as digits as its factorization.

243123132449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 38.

The spelling of 243123132449 in words is "two hundred forty-three billion, one hundred twenty-three million, one hundred thirty-two thousand, four hundred forty-nine".